@Sangho ****
the U.S. embassy in Bangkok does not issue income affidavits any more. That's why you need the 800.000.- THB deposit in your Thai bank account for the first year "retirement extension of stay permit" (the so called "retirement visa"). In order to free the deposit, you need to collect 12 months of consecutive transfers over a minimum of 65.000.- THB, clearly marked in your bankbook as coming in from abroad, into your Thai bank account, month for month. Then for the application to your next "1-year extension of stay permit", you will need a full year bank statement that you have received these funds (income) from abroad